Just to be clear: I was not suggesting that the keyboard was 'stealing' power, but I was asking if the keyboard was used to check if the computer was completely shut down. If you press SHIFT when shut down, and the keyboard lights up, it means the computer was actually running.
Next question: Have you done a Windows 10 Reset (either 'keep my files' or 'delete my files') to try to solve the problem?
Next question: Have you done a Windows 10 Reset (either 'keep my files' or 'delete my files') to try to solve the problem?